Open AccessHigh‐resolution photoemission spectroscopy for the layered antiferromagnetic (La 1− z Nd z ) 0.46 Sr 0.54 MnO 3
Author(s) -
Takeuchi Tsunehiro,
Nozaki Hiroshi,
Soda Kazuo,
Kondo Takeshi,
Mizutani Uichiro,
Yokoya Takayoshi,
Sato Takafumi,
Takahashi Takashi,
Shin Shik,
Muro Takayuki,
Saitoh Yuji,
Moritomo Yutaka
Publication year - 2002
Publication title -
journal of synchrotron radiation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.172
H-Index - 99
ISSN - 1600-5775
DOI - 10.1107/s0909049502008889
Subject(s) - antiferromagnetism , electrical resistivity and conductivity , fermi level , condensed matter physics , x ray absorption spectroscopy , photoemission spectroscopy , density of states , materials science , spectroscopy , curie temperature , electronic structure , atmospheric temperature range , absorption spectroscopy , analytical chemistry (journal) , x ray photoelectron spectroscopy , nuclear magnetic resonance , chemistry , ferromagnetism , physics , electron , quantum mechanics , chromatography , meteorology
High‐resolution HeI photoemission spectroscopy (UPS), Mn 2 p –3 d resonant photoemission spectroscopy (RPES) and Mn 2 p X‐ray absorption spectroscopy (XAS) have been performed to investigate the electronic structure and its effect on the electrical resistivity in (La 1− z Nd z ) 0.46 Sr 0.54 MnO 3 ( z = 0, 0,2, 0.6 and 1.0). It was found that in the UPS and RPES spectra the Fermi edge persisted over the temperature range 15 ≤ T ≤ 340 K regardless of the magnetic structure or the composition of the samples. The density of states at the Fermi level [ N ( E F )] in the samples where 0 ≤ z ≤ 0.6 was increased drastically at the Curie temperature ( T C ) with decreasing temperature, but essentially kept unchanged across the Néel temperature ( T N ). A fairly large reduction at T C and a small increase at T N in the electrical resistivity with decreasing temperature are found to be well accounted for in terms of the temperature dependence of N ( E F ). The presence of a finite N ( E F ) in the insulating Nd 0.46 Sr 0.54 MnO 3 was also found. Thus the origin of the insulating behavior in this sample can be regarded as the Anderson localization associated with the small density of states and the chemical disorder between Nd and Sr.